Python as_coeff_matrices Examples

Example #1

def xxinv(mul):
    """ Y * X * X.I -> Y """
    from sympy.matrices.expressions import Inverse
    factor, matrices = mul.as_coeff_matrices()
    for i, (X, Y) in enumerate(zip(matrices[:-1], matrices[1:])):
        try:
            if X.is_square and Y.is_square and X == Y.inverse():
                I = Identity(X.rows)
                return newmul(factor, *(matrices[:i] + [I] + matrices[i + 2:]))
        except ValueError:  # Y might not be invertible
            pass

    return mul

Example #2

File: matmul.py Project: Jeyatharsini/sympy

def xxinv(mul):
    """ Y * X * X.I -> Y """
    from sympy.matrices.expressions import Inverse
    factor, matrices = mul.as_coeff_matrices()
    for i, (X, Y) in enumerate(zip(matrices[:-1], matrices[1:])):
        try:
            if X.is_square and Y.is_square and X == Y.inverse():
                I = Identity(X.rows)
                return newmul(factor, *(matrices[:i] + [I] + matrices[i+2:]))
        except ValueError:  # Y might not be invertible
            pass

    return mul

Example #3

def factor_in_front(mul):
    factor, matrices = mul.as_coeff_matrices()
    if factor != 1:
        return newmul(factor, *matrices)
    return mul

Example #4

File: matmul.py Project: Jeyatharsini/sympy

def factor_in_front(mul):
    factor, matrices = mul.as_coeff_matrices()
    if factor != 1:
        return newmul(factor, *matrices)
    return mul